Series fan assembly structure

ABSTRACT

A series fan assembly structure includes a first fan and a second fan mated with the first fan. The first fan includes a first frame body and at least one mating section diagonally positioned on two opposite corners of one side of the first frame body. The second fan includes a second frame body and at least one connection section diagonally positioned on two opposite corners of one side of the second frame body corresponding to the mating section. The connection section is connected with the mating section, whereby the series fan assembly structure is easy to rework and has better vibration absorption effect.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a series fan, and more particularly to a series fan assembly structure, which is easy to rework and has better vibration absorption effect. Moreover, the series fan assembly structure is prevented from being damaged when reworked.

2. Description of the Related Art

Recently, the internal circuits of the integrated circuit (IC) chip have been laid out more and more compactly. Consequently, the chip generates higher and higher heat. When a personal computer works, the compact IC chip such as CPU or graphics chip will generate high heat. In order to keep the IC chip functioning lastingly, it is necessary to maintain the IC chip at an optimal working temperature. In this case, rise of temperature can be avoided so as not to deteriorate the efficiency of the IC chip or damage the IC chip. In general, a heat dissipation device is used to directly contact the surface of the electronic component for dissipating the heat generated by the electronic component. Accordingly, the electronic component can keep working normally without shortening its lifetime.

A cooling fan is an inevitable component of a heat dissipation device. The cooling fan is able to quickly carry away the heat absorbed by a radiating fin assembly to complete a thermal cycle and achieve better heat dissipation effect.

In general, two cooling fans are serially connected with each other to dissipate the heat generated by a heat source. Under such circumstance, in case one of the cooling fans fails, the other cooling fan can still operate to dissipate the heat so as to avoid damage of the heat source due to overheating. Moreover, in an operation system with high static pressure, the series cooling fan has better performance and is able to provide higher air volume.

FIG. 1A is a perspective exploded view of a conventional series fan. FIG. 1B is a perspective assembled view of the conventional series fan. The series fan 1 includes a first fan 30 and a second fan 32. The first fan 30 has a first frame body 301 and a first fan impeller 302. The first fan impeller 302 is rotatably disposed in the first frame body 301. The first frame body 301 has a first side 3011 and a second side 3012 opposite to the first side 3011. Multiple protrusions 303 are disposed on four corners of the second side 3012 of the first frame body 301. Each protrusion 303 has a reverse hook section 3031 at a free end of the protrusion 303.

The second fan 32 has a second frame body 321 and a second fan impeller 322. The second fan impeller 322 is rotatably disposed in the second frame body 321. The second frame body 301 has a third side 3211 and a fourth side 3212 opposite to the third side 3211. The fourth side 3212 faces the second side 3012. Multiple through holes 323 are formed on four corners of the fourth side 3212 of the second frame body 321. The protrusions 303 can be correspondingly fitted through the through holes 323 and fixed therein. After the protrusion 303 is fitted through the through hole 323 from one end to the other end of the through hole 323, the reverse hook section 3031 of the protrusion 303 is engaged with an end face of the other end of the through hole 323 so as to serially fixedly connect the first and second fans 30, 32. By means of the protrusions 303 of the first frame body 301 and the through holes 323 of the second frame body 321, the first and second fans 30, 32 can be serially connected. However, a problem is raised that it is hard to rework the series fan. When reworking the series fan, it is necessary to first force the reverse hook sections 3031 of the protrusions 303 into the through holes 323 of the second frame body 321 and then forcedly extract the protrusions 303 out of the through holes 323. When extracting the protrusions 303 out of the through holes 323, it often takes place that the protrusions 303 break due to non-uniform force or over-forcing. Therefore, it is hard to rework the series fan.

Moreover, through the vibration test on the system, it is found that the conventional series fan has higher acceleration value. As a result, in the case that the conventional series fan is installed in an electronic device such as a (computer host), the reading efficiency of the hard disc will be inevitably declined. Also, the vibration absorption effect is poor.

According to the above, the conventional series fan has the following shortcomings:

-   1. It is hard to rework the series fan. -   2. The vibration absorption effect is poor. -   3. The protrusions are likely to damage when reworked.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide a series fan assembly structure, which is easy to rework.

A further object of the present invention is to provide the above series fan assembly structure, which has better vibration absorption effect.

To achieve the above and other objects, the series fan assembly structure of the present invention includes a first fan and a second fan. One side of the first fan is attached to one side of the second fan. The first fan includes a first frame body, a first fan impeller and at least one mating section. The first fan impeller is rotatably disposed in the first frame body. The mating sections are diagonally positioned on two opposite corners of one side of the first frame body. The second fan includes a second frame body, a second fan impeller and at least one connection section. The second fan impeller is rotatably disposed in the second frame body. The connection sections are diagonally positioned on two opposite corners of one side of the second frame body and correspondingly connected with the mating sections. By means of the mating sections and the connection sections connected with the mating sections, the series fan assembly structure is easy to rework and has better vibration absorption effect.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:

FIG. 1A is a perspective exploded view of a conventional series fan;

FIG. 1B is a perspective assembled view of the conventional series fan;

FIG. 2 is a perspective exploded view of a first embodiment of the present invention;

FIG. 3 is a perspective assembled view of the first embodiment of the present invention;

FIG. 4 is a perspective exploded view of a second embodiment of the present invention;

FIG. 5 is a perspective assembled view of the second embodiment of the present invention;

FIG. 6 is a perspective exploded view of a third embodiment of the present invention;

FIG. 7 is a perspective assembled view of the third embodiment of the present invention;

FIG. 8 is a perspective exploded view of a fourth embodiment of the present invention; and

FIG. 9 is a perspective assembled view of the fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 2 and 3. FIG. 2 is a perspective exploded view of a first embodiment of the series fan assembly structure of the present invention. FIG. 3 is a perspective assembled view of the first embodiment of the series fan assembly structure of the present invention. The series fan assembly structure includes a first fan 1 and a second fan 2. One side of the first fan 1 is attached to one side of the second fan 2. The first fan 1 includes a first frame body 11, a first fan impeller 12 and at least one mating section 14. The first frame body 11 has a first side 111, a second side 112 opposite to the first side 111, a first receiving space 114 and a first shaft seat 115. The first shaft seat 115 is disposed in the first receiving space 114 at a center thereof. A first silicon steel sheet set 148 is fitted on the first shaft seat 115.

The first fan impeller 12 is rotatably disposed in the first frame body 11, that is, the first fan impeller 12 is received in the first receiving space 114 and rotatably connected with the first shaft seat 115. The mating sections 14 are diagonally positioned on two opposite corners of one side of the first frame body 11. In this embodiment, the mating sections 14 are diagonally positioned on two opposite corners of the second side 112 of the first frame body 11 for illustration purposes only.

The mating sections 14 include a first mating protrusion 141 and a first mating hole 143 opposite to the first mating protrusion 141. The first mating protrusion 141 axially protrudes from one of the two opposite corners of the second side 112 of the first frame body 11. The first mating protrusion 114 has at least one broken hole 1411 passing through a free end of the first mating protrusion 141, which end is distal from the second side 112. The other of the two opposite corners of the second side 112 of the first frame body 11 is radially notched to form the first mating hole 143. The first mating hole 143 has a locating section 1431 and an open section 1432 in communication with the locating section 1431. The open section 1432 extends from the locating section 1431 to the adjacent edge of the first frame body 11.

Please further refer to FIG. 2. The second fan 2 includes a second frame body 21, a second fan impeller 22 and at least one connection section 24. The second frame body 21 has a third side 211, a fourth side 212, a second receiving space 214 in communication with the first receiving space 114 and a second shaft seat 215. The fourth side 212 is opposite to the third side 211 and attached to the second side 112. The second shaft seat 215 is disposed in the second receiving space 214 at a center thereof. A second silicon steel sheet set 248 is fitted on the second shaft seat 215.

The second fan impeller 22 is rotatably disposed in the second frame body 21, that is, the second fan impeller 22 is received in the second receiving space 214 and rotatably connected with the second shaft seat 215. The connection sections 24 are diagonally positioned on two opposite corners of one side of the second frame body 21 and correspondingly connected with the mating sections 14. In this embodiment, the connection sections 24 are diagonally positioned on two opposite corners of the fourth side 212 of the second frame body 21 for illustration purposes only. The connection sections 24 are connected with the mating sections 14 by way of insertion, screwing or engagement.

The connection sections 24 include a first connection hole 241 corresponding to the first mating protrusion 141 and a first connection protrusion 243 opposite to the first connection hole 241. One of the two opposite corners of the fourth side 212 of the second frame body 21 is radially notched to form the first connection hole 241. The first connection hole 241 has a locating section 2411 and an open section 2412 in communication with the locating section 2411. The open section 2412 extends from the locating section 2411 to the adjacent edge of the second frame body 21. The first mating protrusion 141 is correspondingly inlaid in the first connection hole 241.

Please further refer to FIGS. 2 and 3. The first connection protrusion 243 axially protrudes from the other of the two opposite corners of the fourth side 212 of the second frame body 21. The first connection protrusion 243 is correspondingly inlaid in the first mating hole 143. The first connection protrusion 243 has at least one broken hole 2431 passing through a free end of the first connection protrusion 243, which end is distal from the fourth side 212.

When assembling the first fan 1 with the second fan 2, the first mating protrusion 141 and the first connection protrusion 243 are respectively positioned at the open section 2412 of the first connection hole 241 and the open section 1432 of the first mating hole 143. Then a horizontal inward force is applied to the first frame body 11 (or the second frame body 21) to push/pull the first frame body 11 (or the second frame body 21), whereby the first mating protrusion 141 and the first connection protrusion 243 are respectively moved from the open sections 2412, 1432 into the locating sections 2411, 1431. After the first mating protrusion 141 and the first connection protrusion 243 are respectively inlaid in the locating sections 2411, 1431 of the first connection hole 241 and the first mating hole 143, the second side 112 of the first frame body 11 is tightly attached to the fourth side 212 of the second frame body 21. Under such circumstance, the first fan 1 and the second fan 2 are serially connected with each other to form the series fan.

When disassembling (or separating) the first fan 1 from the second fan 2, an operator only needs to apply a horizontal outward force to the first frame body 11 (or the second frame body 21) to push/pull the first frame body 11 (or the second frame body 21), whereby the first mating protrusion 141 and the first connection protrusion 243 are respectively moved to the open sections 2412, 1432 of the first connection hole 241 and the first mating hole 143. After the first mating protrusion 141 and the first connection protrusion 243 are respectively extracted out of the open sections 2412, 1432, the first fan 1 is separated from the second fan 2. Accordingly, the series fan can be conveniently assembled/disassembled and is easy to rework.

According to the above arrangement, the mating sections 14 of the first fan 1 can be securely connected with the connection sections 24 of the second fan 2 to conveniently assemble the first and second fans 1, 2 with each other.

Moreover, when reworking and disassembling the series fan, the assembly structure of the first and second fans 1, 2 will not be damaged so that it is easy to rework the series fan and a better vibration absorption effect is achieved.

Please now refer to FIGS. 4 and 5. FIG. 4 is a perspective exploded view of a second embodiment of the series fan assembly structure of the present invention. FIG. 5 is a perspective assembled view of the second embodiment of the series fan assembly structure of the present invention. The second embodiment is substantially identical to the first embodiment in structure, connection relationship and effect and thus will not be repeatedly described hereinafter. The second embodiment is different from the first embodiment in that the mating sections 14 further include a second mating hole 144 and a third mating hole 145. The second and third mating holes 144, 145 are diagonally disposed on the other two opposite corners of the second side 112 of the first frame body 11. The other two opposite corners of the second side 112 are radially notched to form the second and third mating holes 144, 145.

As the first mating hole 143, each of the second and third mating holes 144, 145 has a locating section 1441, 1451 and an open section 1442, 1452 in communication with the locating sections 1441, 1451. The open sections 1442, 1452 of the second and third mating holes 144, 145 respectively extend from the locating sections 1441, 1451 to the adjacent edges of the first frame body 11.

The connection sections 24 further include a second connection protrusion 244 and a third connection protrusion 245. The second and third connection protrusions 244, 245 are diagonally disposed on the other two opposite corners of the fourth side 212 of the second frame body 21. The second and third connection protrusions 244, 245 respectively axially protrude from the other two opposite corners of the fourth side 212 of the second frame body 21. The second and third connection protrusions 244, 245 are inlaid in the corresponding second and third mating holes 144, 145, whereby the first and second fans 1, 2 can be more securely assembled with each other to enhance the vibration absorption effect of the series fan.

As the first connection protrusion 243, each of the second and third connection protrusions 244, 245 has at least one broken hole 2441, 2451 passing through a free end of each of the second and third connection protrusions 244, 245, which end is distal from the fourth side 212. Please now refer to FIGS. 6 and 7. FIG. 6 is a perspective exploded view of a third embodiment of the series fan assembly structure of the present invention. FIG. 7 is a perspective assembled view of the third embodiment of the series fan assembly structure of the present invention. The third embodiment is substantially identical to the first embodiment in structure, connection relationship and effect and thus will not be repeatedly described hereinafter. The third embodiment is different from the first embodiment in that the mating sections 14 further include a second mating protrusion 142 and a second mating hole 144 opposite to the second mating protrusion 142. The second mating protrusion 142 axially protrudes from one of the other two opposite corners of the second side 112 of the first frame body 11. The second mating protrusion 142 has at least one broken hole 1421 passing through a free end of the second mating protrusion 142, which end is distal from the second side 112.

The other of the other two opposite corners of the second side 112 of the first frame body 11 is radially notched to form the second mating hole 144. As the first mating hole 143, the second mating hole 144 has a locating section 1441 and an open section 1442 in communication with the locating section 1441. The open section 1442 of the second mating hole 144 extends from the locating section 1441 to the adjacent edge of the first frame body 11. In the first embodiment, the first connection hole 241 and the first connection protrusion 243 are respectively connected with the corresponding first mating protrusion 141 and first mating hole 143 by way of insertion. It should be noted that differently, in the third embodiment, the first connection hole 241 and the first connection protrusion 243 are respectively connected with the corresponding second mating protrusion 142 and second mating hole 144 by way of insertion.

The connection sections 24 further include a second connection protrusion 244 and a second connection hole 242 opposite to the second connection protrusion 244. The second connection protrusion 244 axially protrudes from one of the other two opposite corners of the fourth side 212 of the second frame body 21. The second connection protrusion 244 is inlaid in the corresponding first mating hole 143. The second connection protrusion 244 has at least one broken hole 2441 passing through a free end of the second connection protrusion 244, which end is distal from the fourth side 212.

The other of the other two opposite corners of the fourth side 212 of the second frame body 21 is radially notched to form the second connection hole 242. The first mating protrusion 141 is correspondingly inlaid in the second connection hole 242. As the first connection hole 241, the second connection hole 242 has a locating section 2421 and an open section 2422 in communication with the locating section 2421. The open section 2422 of the second connection hole 242 extends from the locating section 2421 to the adjacent edge of the second frame body 21. The second mating protrusion 142 and the second mating hole 144 are respectively connected with the corresponding first connection hole 241 and the first connection protrusion 243 by way of insertion. Also, the first mating protrusion 141 and the first mating hole 143 are respectively connected with the corresponding second connection hole 242 and the second connection protrusion 244 by way of insertion. Accordingly, the first and second fans 1, 2 can be more securely connected with each other to achieve better vibration absorption effect for the series fan.

Please now refer to FIGS. 8 and 9. FIG. 8 is a perspective exploded view of a fourth embodiment of the series fan assembly structure of the present invention. FIG. 9 is a perspective assembled view of the fourth embodiment of the series fan assembly structure of the present invention. The fourth embodiment is substantially identical to the second embodiment in structure, connection relationship and effect and thus will not be repeatedly described hereinafter. The fourth embodiment is different from the second embodiment in that the first mating protrusion 141 and the first connection hole 241 of the second embodiment are respectively replaced with a fourth mating hole 146 and a fourth connection protrusion 246. In addition, for illustration purposes, the mating sections 14 of the fourth embodiment include a first mating hole 143, a second mating hole 144, a third mating hole 145 and a fourth mating hole 146 instead of the second and third mating holes 144, 145 of the second embodiment. The two opposite corners of the second side 112 are radially notched to form the first and second mating holes 143, 144. The other two opposite corners of the second side 112 are radially notched to form the third and fourth mating holes 145, 146.

Each of the first, second, third and fourth mating holes 143, 144, 145, 146 has a locating section 1431, 1441, 1451, 1461 and an open section 1432, 1442, 1452, 1462 in communication with the locating section 1431, 1441, 1451, 1461. The open sections 1432, 1442, 1452, 1462 of the first, second, third and fourth mating holes 143, 144, 145, 146 respectively extend from the locating sections 1431, 1441, 1451, 1461 to the adjacent edges of the first frame body 11.

In addition, for illustration purposes, the connection sections 24 of the fourth embodiment include a first connection protrusion 243, a second connection protrusion 244, a third connection protrusion 245 and a fourth connection protrusion 246 instead of the second and third connection protrusions 244, 245 of the second embodiment. The first and second connection protrusions 243, 244 respectively axially protrude from the two opposite corners of the fourth side 212 of the second frame body 21. The first and second connection protrusions 243, 244 are inlaid in the corresponding first and second mating holes 143, 144. The third and fourth connection protrusions 245, 246 respectively axially protrude from the other two opposite corners of the fourth side 212. The third and fourth connection protrusions 245, 246 are inlaid in the corresponding third and fourth mating holes 145, 146.

Please further refer to FIGS. 8 and 9. Each of the first, second, third and fourth connection protrusions 243, 244, 245, 246 has at least one broken hole 2431, 2441, 2451, 2461 passing through a free end of each of the first, second, third and fourth connection protrusions 243, 244, 245, 246, which end is distal from the fourth side 212.

When assembling the first fan 1 with the second fan 2, the first, second, third and fourth connection protrusions 243, 244, 245, 246 are respectively positioned at the corresponding open sections 1432, 1442, 1452, 1462 of the first, second, third and fourth mating holes 143, 144, 145, 146. Then a horizontal leftward/rightward force is applied to the first frame body 11 (or the second frame body 21) to rotate the first frame body 11 (or the second frame body 21), whereby the first, second, third and fourth connection protrusions 243, 244, 245, 246 are respectively moved from the corresponding open sections 1432, 1442, 1452, 1462 into the locating sections 1431, 1441, 1451, 1461. After the first, second, third and fourth connection protrusions 243, 244, 245, 246 are respectively inlaid in the locating sections 1431, 1441, 1451, 1461 of the first, second, third and fourth mating holes 143, 144, 145, 146, the second side 112 of the first frame body 11 is tightly attached to the fourth side 212 of the second frame body 21. Under such circumstance, the first fan 1 and the second fan 2 are serially connected with each other to form the series fan.

When disassembling (or separating) the first fan 1 from the second fan 2, an operator only needs to apply a horizontal leftward/rightward force to the first frame body 11 (or the second frame body 21) to rotate the first frame body 11 (or the second frame body 21), whereby the first, second, third and fourth connection protrusions 243, 244, 245, 246 are respectively moved to the corresponding open sections 1432, 1442, 1452, 1462 of the first, second, third and fourth mating holes 143, 144, 145, 146. After the first, second, third and fourth connection protrusions 243, 244, 245, 246 are respectively extracted out of the corresponding open sections 1432, 1442, 1452, 1462, the first fan 1 is separated from the second fan 2. Accordingly, the series fan can be conveniently assembled/disassembled and is easy to rework to achieve an excellent vibration absorption effect.

According to the above arrangement, in comparison with the conventional device, the present invention has the following advantages:

-   1. The series fan assembly structure of the present invention is     easy to rework. -   2. The series fan assembly structure of the present invention has     better vibration absorption effect. -   3. The series fan assembly structure of the present invention is     prevented from being damaged when reworked.

The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. It is understood that many changes and modifications of the above embodiments can be made without departing from the spirit of the present invention. The scope of the present invention is limited only by the appended claims. 

What is claimed is:
 1. A series fan assembly structure comprising: a first fan including a first frame body, a first fan impeller and at least one mating section, the first fan impeller being rotatably disposed in the first frame body, the mating sections being diagonally positioned on two opposite corners of one side of the first frame body; and a second fan, one side of the second fan being attached to one side of the first fan, the second fan including a second frame body, a second fan impeller and at least one connection section, the second fan impeller being rotatably disposed in the second frame body, the connection sections being diagonally positioned on two opposite corners of one side of the second frame body and correspondingly connected with the mating sections.
 2. The series fan assembly structure as claimed in claim 1, wherein the first frame body has a first side and a second side opposite to the first side and the second frame body has a third side and a fourth side opposite to the third side, the second side being attached to the fourth side.
 3. The series fan assembly structure as claimed in claim 2, wherein the mating sections include a first mating protrusion and a first mating hole opposite to the first mating protrusion, the first mating protrusion axially protruding from one of the two opposite corners of the second side of the first frame body, the other of the two opposite corners of the second side of the first frame body being radially notched to form the first mating hole.
 4. The series fan assembly structure as claimed in claim 3, wherein the connection sections include a first connection hole corresponding to the first mating protrusion and a first connection protrusion opposite to the first connection hole, one of the two opposite corners of the fourth side of the second frame body being radially notched to form the first connection hole, the first mating protrusion being correspondingly inlaid in the first connection hole, the first connection protrusion axially protruding from the other of the two opposite corners of the fourth side of the second frame body, the first connection protrusion being correspondingly inlaid in the first mating hole.
 5. The series fan assembly structure as claimed in claim 4, wherein the mating sections further include a second mating hole and a third mating hole, the second and third mating holes being diagonally disposed on the other two opposite corners of the second side of the first frame body, the other two opposite corners of the second side being radially notched to form the second and third mating holes.
 6. The series fan assembly structure as claimed in claim 5, wherein the connection sections further include a second connection protrusion and a third connection protrusion, the second and third connection protrusions being diagonally disposed on the other two opposite corners of the fourth side of the second frame body, the second and third connection protrusions respectively axially protruding from the other two opposite corners of the fourth side, the second and third connection protrusions being respectively inlaid in the corresponding second and third mating holes.
 7. The series fan assembly structure as claimed in claim 3, wherein the connection sections include a first connection hole and a first connection protrusion opposite to the first connection hole, one of the two opposite corners of the fourth side of the second frame body being radially notched to form the first connection hole, the first connection protrusion axially protruding from the other of the two opposite corners of the fourth side of the second frame body.
 8. The series fan assembly structure as claimed in claim 7, wherein the mating sections further include a second mating protrusion and a second mating hole opposite to the second mating protrusion, the second mating protrusion axially protruding from one of the other two opposite corners of the second side of the first frame body, the second mating protrusion being correspondingly inlaid in the first connection hole, the other of the other two opposite corners of the second side of the first frame body being radially notched to form the second mating hole, the first connection protrusion being correspondingly inlaid in the second mating hole.
 9. The series fan assembly structure as claimed in claim 8, wherein the connection sections further include a second connection protrusion and a second connection hole opposite to the second connection protrusion, the second connection protrusion axially protruding from one of the other two opposite corners of the fourth side of the second frame body, the second connection protrusion being correspondingly inlaid in the first mating hole, the other of the other two opposite corners of the fourth side of the second frame body being radially notched to form the second connection hole, the first mating protrusion being correspondingly inlaid in the second connection hole.
 10. The series fan assembly structure as claimed in claim 2, wherein the mating sections include a first mating hole, a second mating hole, a third mating hole and a fourth mating hole, the two opposite corners of the second side being radially notched to form the first and second mating holes, the other two opposite corners of the second side being radially notched to form the third and fourth mating holes.
 11. The series fan assembly structure as claimed in claim 10, wherein the connection sections include a first connection protrusion, a second connection protrusion, a third connection protrusion and a fourth connection protrusion, the first and second connection protrusions axially protruding from the two opposite corners of the fourth side, the first and second connection protrusions being respectively inlaid in the corresponding first and second mating holes, the third and fourth connection protrusions axially protruding from the other two opposite corners of the fourth side, the third and fourth connection protrusions being respectively inlaid in the corresponding third and fourth mating holes.
 12. The series fan assembly structure as claimed in claim 5, wherein each of the first, second and third mating holes has a locating section and an open section in communication with the locating section, the open sections of the first, second and third mating holes respectively extending from the locating sections to the adjacent edges of the first frame body.
 13. The series fan assembly structure as claimed in claim 6, wherein the first connection hole has a locating section and an open section in communication with the locating section, the open section of the first connection hole extending from the locating section to the adjacent edges of the second frame body.
 14. The series fan assembly structure as claimed in claim 12, wherein the first mating protrusion has at least one broken hole passing through a free end of the first mating protrusion, which end is distal from the second side.
 15. The series fan assembly structure as claimed in claim 13, wherein each of the first, second and third connection protrusions has at least one broken hole passing through a free end of each of the first, second and third connection protrusions, which end is distal from the fourth side.
 16. The series fan assembly structure as claimed in claim 9, wherein each of the first, second and third connection protrusions has at least one broken hole passing through a free end of each of the first, second and third connection protrusions, which end is distal from the fourth side.
 17. The series fan assembly structure as claimed in claim 16, wherein each of the first and second connection protrusions has at least one broken hole passing through a free end of each of the first and second connection protrusion, which end is distal from the fourth side, each of the first and second connection holes having a locating section and an open section in communication with the locating section, the open sections of the first and second connection holes respectively extending from the locating sections to the adjacent edges of the second frame body.
 18. The series fan assembly structure as claimed in claim 11, wherein each of the first, second, third and fourth mating holes has a locating section and an open section in communication with the locating section, the open sections of the first, second, third and fourth mating holes respectively extending from the locating sections to the adjacent edges of the first frame body.
 19. The series fan assembly structure as claimed in claim 18, wherein each of the first, second, third and fourth connection protrusions has at least one broken hole passing through a free end of each of the first, second, third and fourth connection protrusions, which end is distal from the fourth side.
 20. The series fan assembly structure as claimed in claim 1, wherein the connection sections are connected with the mating sections by way of insertion, screwing or engagement. 